/*
    Copyright 2006 Andrew Wilkinson <andrew@indiegigs.co.uk>

    This file is part of libgp2x.

    libgp2x is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    libgp2x is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with libgp2x; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include <stdlib.h>

#define NO_INTERNAL
#include "gp2x_internal.h"

void* calloc(size_t nmemb, size_t size) {
    void* ptr = malloc(nmemb * size);
    if(ptr == NULL) { return NULL; }
    memset(ptr, 0, nmemb * size);
    return ptr;
}

void* memset(void* s, int c, size_t n) {
    int i;
    unsigned char* mem = (unsigned char*)s;
    for(i = n; i >= 0; i--) {
        *mem = c;
        mem++;
    }
    return s;
}

void* memcpy(void* dest, const void* src, size_t n) {
    int i;
    unsigned char* mem = (unsigned char*)dest;
    unsigned char* smem = (unsigned char*)src;
    for(i = n; i >= 0; i--) {
        *mem = *smem;
        mem++; smem++;
    }
    return dest;
}

void* memchr(const void* s, int c, size_t n) {
    unsigned char* mem = (unsigned char*)s;
    unsigned char val = (unsigned char)c;
    while(n > 0) {
        if(*mem == val) { break; }
        mem++;
        n--;
    }
    if(n == 0) {
        return NULL;
    } else {
        return (void*)s;
    }
}

int memcmp(const void* s1, const void* s2, size_t n) {
    unsigned char* m1 = (unsigned char*)s1;
    unsigned char* m2 = (unsigned char*)s2;
    while(n > 0) {
        if(*m1 < *m2) {
            return -1;
        } else if(*m1 < *m2) {
            return 1;
        }
    }
    return 0;
}
